Function applyEditToFile

src/tools/FileEditTool/utils.ts:206–228

(
  originalContent: string,
  oldString: string,
  newString: string,
  replaceAll: boolean = false,
)

 * @returns Array of edits with replace_all guaranteed to be boolean
 */
export function applyEditToFile(
  originalContent: string,
  oldString: string,
  newString: string,
  replaceAll: boolean = false,
): string {
  const f = replaceAll
    ? (content: string, search: string, replace: string) =>
        content.replaceAll(search, () => replace)
    : (content: string, search: string, replace: string) =>
        content.replace(search, () => replace)

  if (newString !== '') {
    return f(originalContent, oldString, newString)
  }

  const stripTrailingNewline =
    !oldString.endsWith('\n') && originalContent.includes(oldString + '\n')

  return stripTrailingNewline
    ? f(originalContent, oldString + '\n', newString)
    : f(originalContent, oldString, newString)
}

/**
 * Applies an edit to a file and returns the patch and updated file.